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1, 20, 220, 2330, 24640, 261050, 2771560, 29487170, 314358880, 3357947690, 35937424600, 385311670610, 4138428376720, 44522712143930, 479749833583240, 5177248169415650, 55949729863572160, 605447028499293770
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| G.f.: 1/(1-11*x)+1/(1-10*x)-1/(1-x). E.g.f.: e^(11*x)+e^(10*x)-e^x.
a(n)=21*a(n-1)-110*a(n-2)-90 with a(0)=1, a(1)=20 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 21 2010]
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MATHEMATICA
| Table[11^n+10^n-1, {n, 0, 20}] (* From Harvey P. Dale, Feb 24 2011 *}
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CROSSREFS
| A155654, A155655, A155656, A155657, A155658, A155659, A155660, A155661, A155662, A155663, A155664, A155665, A155666, A155667, A155668, A155669, A155670, A155671, A155672
Sequence in context: A140236 A004411 A140354 * A000833 A178261 A054329
Adjacent sequences: A155670 A155671 A155672 * A155674 A155675 A155676
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KEYWORD
| nonn
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AUTHOR
| Mohammad K. Azarian (azarian(AT)evansville.edu), Feb 01 2009
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